Ups

[DynamoBen]

See this link to get you started.

http://dansdata.com/diyups.htm

[PJALM]

Thanks for the info.

That is basically what I have now so the next step is the make the interface between them. I want to be able to monitor the UPS so that I can shut down the computer equipment before the batteries run out of power.

Do you think it is possible to do this with a PIC?

[DynamoBen]

Possibly you will want to research APC's serial protocol unless you are making your own application to shut down the PC. Beyond that look into A/D conversion, by searching the list.

[Pic_User]

This paper shows some of the design considerations with a PIC18F452 and Insulated Gate Bipolar Transistors (IGBTs).

Uninterruptible Power Supply paper
http://ece.uakron.edu/SDmaterial/fal...n%20Report.pdf